21663545662360 has 64 divisors (see below), whose sum is σ = 56650434220800. Its totient is φ = 7301611510656.

The previous prime is 21663545662351. The next prime is 21663545662439. The reversal of 21663545662360 is 6326654536612.

It is a super-2 number, since 2×21663545662360² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655659802 + ... + 655692841.

It is an arithmetic number, because the mean of its divisors is an integer number (885163034700).

Almost surely, 2^{21663545662360} is an apocalyptic number.

21663545662360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21663545662360 is an abundant number, since it is smaller than the sum of its proper divisors (34986888558440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21663545662360 is a wasteful number, since it uses less digits than its factorization.

21663545662360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311352720 (or 1311352716 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 55.

The spelling of 21663545662360 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred forty-five million, six hundred sixty-two thousand, three hundred sixty".